Question about Yamaha Boating
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Posted on Jan 02, 2017
put into nuetral,undo the five bolts around lower unit,take off sideplate halfway down leg casing,loosen the two bolts clamping the gear rods together,then lower unit should slide down[if driveshaft isnt stuck in the crankshaft spline].assembly is reverse,but take care putting water tube back into rubber grommet,and tighten gear rod clamp only after making sure that g/box is in nuetral,when gear lever also in nuetral,or matched together
Posted on Jul 01, 2010
Testimonial: "thank you so much for you help on the johnson 25hp lower unit . without your help we never could have done it. it is put back together and works great!!! keep up the great work. mamawhughes"
SOURCE: lower unit oil
On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps
Posted on Jul 10, 2010
Most modern outboards had 2 tapped holes in the casting which would let you put a steering wheel puller on that part wit some all thread and push aginst the end of the prop shaft to get that piece off the lower.o
Posted on Oct 14, 2012
You do not have to remove the top plug. Just loosen it enough to allow oil to drain out the bottom. Same with filling, the top plug just has to be loose enough for air to escape as you pump oil in from the bottom. When the oil starts to seep out the top, stop pumping, close the top port screw and then put the bottom screw plug in. With the top port closed there should be enough vacuum created you shouldn't loose more than a few drops while installing the bottom plug. Please do not over fill the gear case, it needs a little air space. Also, try to avoid over pressurizing the gear case while testing, it only takes a couple pounds to identify a leak and not much more to create one. Another thing, change your gear oil in the fall before freeze up. If you store your outboard outside all winter and there is a little water emulsified in the gear oil, it will separate and freeze,, I have seen more than a few cracked gear cases from this alone.
Posted on Jun 15, 2013
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